EP0507543A2 - Antennenanordnungen - Google Patents

Antennenanordnungen Download PDF

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Publication number
EP0507543A2
EP0507543A2 EP92302816A EP92302816A EP0507543A2 EP 0507543 A2 EP0507543 A2 EP 0507543A2 EP 92302816 A EP92302816 A EP 92302816A EP 92302816 A EP92302816 A EP 92302816A EP 0507543 A2 EP0507543 A2 EP 0507543A2
Authority
EP
European Patent Office
Prior art keywords
mesh
arrangement
filaments
reflector
coated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP92302816A
Other languages
English (en)
French (fr)
Other versions
EP0507543A3 (en
Inventor
Robert Fraser Sims
Norman Harrison
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Semiconductors Ltd
Original Assignee
Marconi Electronic Devices Ltd
Plessey Semiconductors Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Marconi Electronic Devices Ltd, Plessey Semiconductors Ltd filed Critical Marconi Electronic Devices Ltd
Publication of EP0507543A2 publication Critical patent/EP0507543A2/de
Publication of EP0507543A3 publication Critical patent/EP0507543A3/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
    • H01Q15/142—Apparatus or processes specially adapted for manufacturing reflecting surfaces using insulating material for supporting the reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/14—Reflecting surfaces; Equivalent structures
    • H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions [2D], e.g. paraboloidal
    • H01Q15/168—Mesh reflectors mounted on a non-collapsible frame

Definitions

  • This invention relates to antenna arrangements and more particularly to arrangements including a reflector which is substantially transparent to visible radiation.
  • the invention is particularly useful for domestic applications where it is wished to minimise the visual intrusion of a dish antenna used for receiving satellite television signals, for example.
  • the reflective surface comprises a mesh of stainless steel.
  • the mesh size is chosen such that the reflector has a sufficiently large open aspect that the human eye perceives it as being partially transparent and is able to discern, to a greater or lesser extent, what lies behind it.
  • stainless steel mesh is expensive to fabricate, or to buy in, as it requires a number of processing steps to produce it. It can also prove difficult to shape the mesh to the configuration required for optimised signal reception.
  • the present invention arose from an attempt to produce an improved reflector which is substantially transparent to optical radiation and is particularly suitable for domestic satellite television reception.
  • an antenna arrangement including a rigid reflector comprising non-rigid filamentary material arranged as a mesh, the mesh being coated with electrically conductive material such that it has a sufficiently large open aspect to be substantially transparent to visible radiation, and at least two pre-formed optically transmissive sheets between which the coated mesh is laminated.
  • the filamentary material may comprise twisted fibres or could be a single, long fibre.
  • the filaments forming the pattern could be a plurality of separate lengths of material or a single length of material doubled back on itself, for example.
  • the reflector may be made more cheaply than is the case with presently available reflectors because the materials used need not be as expensive as the conventional metal mesh.
  • the coated mesh can be made more flexible than a stainless steel mesh, thus fabrication of the reflector surface can be facilitated.
  • the conductive material which coats the mesh need not be thick enough to be structurally self supporting, unlike a mesh made entirely from metal in which a certain amount of material is required to maintain the integrity of the structure. If only a thin coating of the substance is used, this, together with the flexibility of the coated filamentary material as a whole, provides a reflector material which can be readily shaped into the correct configuration to provide a reflector surface.
  • the coated mesh is incorporated in a laminated structure it can also be very thin. The mesh is coated rather than the filamentary material, resulting in ease of manufacture and enabling a uniform coated to be applied.
  • the filaments of the material are arranged in a mesh which defines a crossing pattern.
  • the crossing pattern is produced by knitting, in which a filament forming one row loops into filaments in adjacent rows. This process produces a fabric which is particularly elastic.
  • filaments are woven to produce the pattern. In this method the filaments are arranged in two groups, filaments in each group being substantially parallel and the filaments of the two groups being approximately orthogonal. The filaments are interleaved to produce the fabric.
  • a pattern may be used in which the filaments are in a crossing relationship but which do not interlock, for example, one group of parallel filaments may be laid orthogonally across another group of parallel filaments and adjacent to it so that the two layers together form a mesh having no interlocking or interleaving of the filaments, the coating process causing the filaments to be permanently joined together.
  • the electrically conductive material need not coat the mesh entirely providing there is sufficient to give an acceptable level of reflection.
  • the coating may be only on one side of the mesh.
  • the filamentary material is advantageously a synthetic material, such as Nylon (trade mark) or spun polythene because of the elastic and hard wearing properties of such materials.
  • Nylon trademark
  • spun polythene because of the elastic and hard wearing properties of such materials.
  • it could, for example, be a natural material such as long glass fibres which are twisted together to produce a filament.
  • the electrically conductive coating is preferably one which can be electrodelessly applied to the mesh as this is a particularly convenient and inexpensive technique, and can be quickly carried out.
  • nickel may be employed.
  • the coated mesh has a sufficiently large open aspect as to permit transmission of greater than approximately 60% of visible light incident thereon. This is a sufficiently high transmission value for the human eye to perceive the reflector as being substantially transparent such that features behind the reflector are discernible.
  • the coated mesh is located nearer the front of the structure than the back to optimise the reflection characteristics.
  • a method of manufacturing an antenna arrangement in accordance with the invention comprises the steps of: forming filamentary material in non-rigid elongate form into a mesh; coating the mesh with electrically conductive material, the thickness of the filamentary material and the coating being such that it has a sufficiently large open aspect as to appear visually transparent; and laminating the coated mesh between two sheets of optically transmissive material.
  • a domestic antenna arrangement for receiving television signals from a satellite broadcast at a frequency of some tens of gigahertz, includes a reflector 1 and feed 2 which are mounted by a bracket 3 on a wall 4.
  • the reflector 1 reflects radiation at the satellite broadcasting frequency and is partially transparent to visible light such that an onlooker is able to discern features of the wall 4 located behind it.
  • the transparent reflector 1 is shown in greater detail in Figure 2 which is a cross-sectional view.
  • the reflector 1 is a laminated structure being made up of ten sheets 5 of a clear plastic, each sheet being approximately 0.25mm thick.
  • the reflective surface 6 of the reflector comprises a knitted mesh 7 of Nylon (trademark) which has a coating 8 of nickel.
  • the reflective surface 6 is laminated between two sheets towards the front surface 9 of the reflector.
  • Figure 3 is a front view of the reflector surface 6, showing the nickel coating 8. The aspect ratio is chosen so that approximately 65% of incident visible light is transmitted through the reflector 1.
  • Figure 4 illustrates the knitted pattern of the mesh 7, the filaments used having a diameter of approximately 25 microns.
  • the filamentary material is first knitted together to give a mesh 7 as shown in Figure 4.
  • the mesh 7 is then coated with nickel using electrodeless deposition to give the structure shown in Figure 3.
  • the coated mesh is laminated between transparent sheets as shown in Figure 2.
  • the filamentary material is arranged in a woven pattern of filaments as schematically shown in Figure 5, the filaments in this case being of polyester.
  • the fabric shown in Figure 5 is electrodelessly plated with a layer of copper and laminated between optically transmissive plastic sheets to form a rigid reflector of microwave radiation.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Aerials With Secondary Devices (AREA)
  • Woven Fabrics (AREA)
EP19920302816 1991-04-02 1992-03-31 Antenna arrangements Ceased EP0507543A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB919106840A GB9106840D0 (en) 1991-04-02 1991-04-02 Antenna arrangements
GB9106840 1991-04-02

Publications (2)

Publication Number Publication Date
EP0507543A2 true EP0507543A2 (de) 1992-10-07
EP0507543A3 EP0507543A3 (en) 1993-03-17

Family

ID=10692485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920302816 Ceased EP0507543A3 (en) 1991-04-02 1992-03-31 Antenna arrangements

Country Status (2)

Country Link
EP (1) EP0507543A3 (de)
GB (1) GB9106840D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0584974A1 (de) * 1992-08-28 1994-03-02 Plessey Semiconductors Limited Antennenanordnungen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750321A (en) * 1951-09-04 1956-06-12 Raymond De Icer And Engineerin Antennas and material for fabrication thereof
GB759442A (en) * 1954-10-14 1956-10-17 Marconi Wireless Telegraph Co Improvements in or relating to radio mirrors and lenses
US3047860A (en) * 1957-11-27 1962-07-31 Austin B Swallow Two ply electromagnetic energy reflecting fabric
US3969731A (en) * 1970-02-11 1976-07-13 Hughes Aircraft Company Mesh articles particularly for use as reflectors of radio waves
US4191604A (en) * 1976-01-07 1980-03-04 General Dynamics Corporation Pomona Division Method of constructing three-dimensionally curved, knit wire reflector
WO1991008598A1 (en) * 1989-12-01 1991-06-13 Sheraton Investments Limited An antenna
DE9001255U1 (de) * 1990-02-03 1990-04-05 Hagenbusch, Günther, 7313 Reichenbach Satellitenempfangsantenne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0584974A1 (de) * 1992-08-28 1994-03-02 Plessey Semiconductors Limited Antennenanordnungen

Also Published As

Publication number Publication date
EP0507543A3 (en) 1993-03-17
GB9106840D0 (en) 1991-05-22

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